Apparatus for grinding lathe-centers



(No Model.) I

T. W. R. MGCABE.

APPARATUS FOR GRINDING LATHE CENTERS; I No. 394,786. Patented Dec. 18,1888.

WITNESSES /AWZ,

N PETERS, PhnlmLithographar. Wnshingkm. 0.1;

UNTTED STATES I PATENT EEicE.

THOMAS \V. R. MCOABE, OF PHILADELPHIA, PENNSYLVANIA.

APPARATUS FOR GRINDING LATHE-CENTERS.

SPECIFICATION forming part of Letters Patent No. 394,786, dated December18, 1888.

Appheation filed May 14, 1887.

To all whom it may concern:

Be it known that I, THOMAS IV. R. MOCABE, a citizen of the UnitedStates, residing in the city and county of Philadelphia, State ofPennsylvania, have invented a new and useful Improvement in Apparatusfor Grinding Centers of Lathes, which improvement is fully set forth inthe following specification and accompanying drawings.

My invention relates to improvements in apparatus for grinding centersof lathes; and it consists in the construction and combination of partsas herein set forth.

Figure 1. represents a partial plan view and partial horizontal sectionof an apparatus for grinding lathe-centers embodying my invention. Fig.2 represents a view of the facingpiece thereof. Fig. represents asection in line a0 a3, Fig. 2. Fig. t represents a section in line y y,Fig. (3. Fig. 5 represents a section in line 2 .2, Fig. 4. Fig. 6represents a top view of the bearing portion of the grindingwheel.

Similar letters of reference indicate corresponding parts in the severalfigures.

Referring to the drawings, A represents the center of a lathe, the samebeing connected with the rotatable head or disk "I, and 0 represents thetool-post, which features are of well-known construction.

D represents a frame, which has an arm, E,

for securing the same to the tool-post, said frame being adapted forsupporting the parts of the apparatus embodying my invention.

\Vithin the boss A, at one end of the frame, is a rotatable sleeve, F,within which is a shaft, F, connected with said sleeve by a feather, soas to rotate therewith. To the outer end of the shaft F is secured apulley, G, which has a beveled face, a, and is adapted to be placed infrictional contact with the head B, it being noticed that the shaft F isset obliquely to the axis of said head. To the end of the boss A isfitted a set-screw,II, which bears against a spring, II, at the end ofthe shaft F opposite to the pulley G for holdingthe latter in operativeposition against the head I In order to prevent motion of the screw Hafter adj nstment, I employ a j am-nut, J, which Serial No. 238,178. (Nomodel.)

is fitted on said screw and tightens against a collar J which is securedto the sleeve F by a screw, J".

At the end of the frame A opposite to the boss A is a boss, A which isparallel with said boss A and likewise oblique to the axis of the head I\Vithin the boss A is a rotatable sleeve, K, to the exterior of which issecured a pulley, N, which enters a recess, Z), in the boss A Throughthe sleeve K is passed a shaft, P, which is connected with said sleeveby a feather, whereby the shaft may be moved in oppositedirections or inand out while receiving rotation from the pulley N. The end of the shafttoward the head B carries an emery or other grinding wheel Q, which, aswill be seen, has its periphery coutignous to the lathe-center A andparallel with the side thereof. the shaft carries a knob, R, forconvenience of working the shaft P in and out of the sleeve K as itsbearings.

Secured to the sleeve F is a pulley, F around which passes an endlessbelt or band, S, which also passes around the pulley N, so as to operatethe latter.

It will be seen that when the apparatus is located in position andsecured to the toolpost the pulley G is advanced against the head B andheld thereat by the spring II. The pulley receives motion from the headB, which, as well known, constitutes part of the lathe and is nowrunning, and causes the rotation of the sleeve F, and consequently ofthe pulley Owing to the belt S, power is communicated to the pulley N,and consequently to the shaft P, whereby the grindingwheel Q is rotated.The wheel Q, as running, is now moved along the side of the center bydrawing the shaft P in and out of the sleeve K, said sleeve and shaft,however, continuing its rotation. In this manner the center may bequickly and uniformly ground, and when the work is acconmlished theapparatus may be readily disconnected from the tool-post and removed.

Owing to slots existing in the head B, it is desirable to cover the samein order to pre vent irregular motion of the pulley G. For this purposeI employ a facing-plate, T, which The opposite end of is temporarilysecured to the head B and has a central opening, (1, through which thecenter A projects.

In lieu of the belt S, the pulleys F N may be of the form of pinions orspur-wheels which mesh with each other, and thus cause the rotation ofthe grinding-wheel.

As the shaft F is connected with the sleeve I by a 'l'eather, said shaftmay slide in and out of said sleeve, whereby the friction-disk may beset or adjusted relatively to the distance of the head 1-3 from theframe D.

The pressure of the spring ll against the shaft, and consequentlyagainst the frictionpulley (l, is adjusted by the screw ll.

.1 laving thus described my invention, what I claim as new, and desireto secure by Letters Patent, is

1. In an apparatus of the character named,

a boss with sleeve having a bearing in said boss, a shaft longitudinallymovable in said sleeve and having a bevel-pulley thereon, a springbearing against the end. of said shaft, the collar J secured by screw Jto said sleeve, and a screw, ll, bearing against said spring, said partsbeing combined substantially as and for the purpose set forth.

3. An apparatus of the character named, ermsisting of the frame 'D withthe bosses A A the sleeve F, journaled in the boss A and carrying thepulley F, the shat't F, rotatably secured to the sleeve F by afeather-connection and carrying the bevel-faced pulley G, a spring andscrew adjusting mechanism secured to said sleeve 15 for said shaft F,the sleeve K, journaled in the boss A the shaft 1, havingleather-eminect ion with said sleeve K and carrying the emeryavheel Q, apulley eormecled to said sleeve K, and the band S, connecting the pulleyF and the pulley 01] sleeve K, said parts being coml'iined substan- 5otially as described.

'1. W. R. MCCABE.

Witnesses:

JoI-IN A. \VIEDERsHELM, .li-xs. I1. KELLY.

